JPS5549716A - Speed adjustment unit - Google Patents
Speed adjustment unitInfo
- Publication number
- JPS5549716A JPS5549716A JP12153878A JP12153878A JPS5549716A JP S5549716 A JPS5549716 A JP S5549716A JP 12153878 A JP12153878 A JP 12153878A JP 12153878 A JP12153878 A JP 12153878A JP S5549716 A JPS5549716 A JP S5549716A
- Authority
- JP
- Japan
- Prior art keywords
- speed
- frequency
- speed adjustment
- adjustment
- signals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Control Of Velocity Or Acceleration (AREA)
Abstract
PURPOSE: To make the adjustment of a playing speed possible under a state phasing a crystal oscillation frequency without a local oscillator by dividing directly the reference frequency to take out speed signals in the playing speed adjustment unit of acoustic apparatus.
CONSTITUTION: The output reference frequency of crystal oscillator 2 is divided by variable frequency divider 14, and optimum frequency division ratio n calculated by frequency division ratio operation circuit 15 is set to obtain reference speed signals for phasesynhronization of the rotation of a motor. T-type FF16 makes the pulse width of reference speed signals of the 1/2 period accurately. The output of frequency generator 12 is inputted to phase comparator circuit 8 together with the reference speed, and the output becomes input signals of motor driving circuit 10. In this case, on local oscillator is used in the synchronization system, so that a fixed- width speed adjustment and a speed adjustment dependent upon the scale are possible, and a speed adjustment in an arbitrary width is possible.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12153878A JPS5549716A (en) | 1978-10-04 | 1978-10-04 | Speed adjustment unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12153878A JPS5549716A (en) | 1978-10-04 | 1978-10-04 | Speed adjustment unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5549716A true JPS5549716A (en) | 1980-04-10 |
Family
ID=14813716
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12153878A Pending JPS5549716A (en) | 1978-10-04 | 1978-10-04 | Speed adjustment unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5549716A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS494119A (en) * | 1972-05-02 | 1974-01-14 | ||
JPS5025988A (en) * | 1973-07-09 | 1975-03-18 | ||
JPS5079246A (en) * | 1973-11-12 | 1975-06-27 |
-
1978
- 1978-10-04 JP JP12153878A patent/JPS5549716A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS494119A (en) * | 1972-05-02 | 1974-01-14 | ||
JPS5025988A (en) * | 1973-07-09 | 1975-03-18 | ||
JPS5079246A (en) * | 1973-11-12 | 1975-06-27 |
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